Increasing db_block_buffers will almost certainly make no difference to the performance of the query you've shown us.
Manipulation of hash_area_size might change your query's execution plan, but I can't tell you whether for better or for worse. But it is important to understand that changing hash_area_size might profoundly change a lot of other execution plans in your system as well. Some for better, and--I'm sure--some for worse. Your log buffer size is very likely an irrelevance with respect to your query performance. Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Hotsos Clinic, Dec 9-11 Honolulu - 2003 Hotsos Symposium on OracleR System Performance, Feb 9-12 Dallas - Jonathan Lewis' Optimising Oracle, Nov 19-21 Dallas -----Original Message----- Alavi Sent: Thursday, November 14, 2002 11:59 AM To: Multiple recipients of list ORACLE-L Hi Again, Another question is, if i increase the following parameter is there any negative effective or not? 1) db_block_buffers = 10000 change to 20000 2) hash_area_size = 2048000 change to 51200000 5 M 3) log_buffer = 262144 change to 5242880 5 M Thanks Hamid Alavi Office 818 737-0526 Cell 818 416-5095 ======================= Confidentiality Statement ======================= The information contained in this message and any attachments is intended only for the use of the individual or entity to which it is addressed, and may contain information that is PRIVILEGED, CONFIDENTIAL and exempt from disclosure under applicable law. If you have received this message in error, you are prohibited from copying, distributing, or using the information. Please contact the sender immediately by return e-mail and delete the original message from your system. ===================== End Confidentiality Statement ===================== -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Hamid Alavi INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Cary Millsap INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
